[Buildroot] [PATCH v3] util-linux: fix link failures due to name clash

[Carlos Santos <casantos@datacom.ind.br>]

> From: "Luca Ceresoli" <luca@lucaceresoli.net>
> To: buildroot at buildroot.org
> Cc: "Luca Ceresoli" <luca@lucaceresoli.net>, "Adam Duskett" <aduskett@gmail.com>
> Sent: Wednesday, November 8, 2017 3:38:01 PM
> Subject: [Buildroot] [PATCH v3] util-linux: fix link failures due to name clash

> Several packages have a similar md5.c file, and each has a function
> named byteReverse(). This generates link errors when building
> statically ("multiple definition of `byteReverse'").
> 
> Fix by applying a patch from upstream.
> 
> Fixes:
>  http://autobuild.buildroot.net/results/419ab2c0e034cc68991281c51caa8271b0fadbab/
> 
> Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
> Cc: Adam Duskett <aduskett@gmail.com>
> 
> ---
> 
> Changed v2 -> v3:
> - patch is now upstream, so add URL
> 
> Changed v1 -> v2:
> - add Submitted-upstream tag now that it's on the util-linux ml
> ---
> .../0001-md5-declare-byteReverse-as-static.patch   | 44 ++++++++++++++++++++++
> 1 file changed, 44 insertions(+)
> create mode 100644
> package/util-linux/0001-md5-declare-byteReverse-as-static.patch
> 
> diff --git a/package/util-linux/0001-md5-declare-byteReverse-as-static.patch
> b/package/util-linux/0001-md5-declare-byteReverse-as-static.patch
> new file mode 100644
> index 000000000000..a5b290c4dbe6
> --- /dev/null
> +++ b/package/util-linux/0001-md5-declare-byteReverse-as-static.patch
> @@ -0,0 +1,44 @@
> +From 424cee0f06ece9473786c189ab4741e1dea7061d Mon Sep 17 00:00:00 2001
> +From: Luca Ceresoli <luca@lucaceresoli.net>
> +Date: Tue, 7 Nov 2017 14:39:09 +0100
> +Subject: [PATCH] md5: declare byteReverse as static
> +
> +byteReverse() is an internal function in md5.c, and is not exposed via
> +any header file, but it is not declared as static. This is a problem
> +with the md5.c file since it is copied more or less verbatim in other
> +programs (fontconfig and pjsip among others), causing a link error
> +when linking two of them together.
> +
> +Fixes link failures such as:
> +
> http://autobuild.buildroot.net/results/419ab2c0e034cc68991281c51caa8271b0fadbab/build-end.log
> +
> +[Upstream patch:
> https://git.kernel.org/pub/scm/utils/util-linux/util-linux.git/commit/?id=424cee0f06ece9473786c189ab4741e1dea7061d]
> +
> +Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
> +---
> + lib/md5.c | 4 ++--
> + 1 file changed, 2 insertions(+), 2 deletions(-)
> +
> +diff --git a/lib/md5.c b/lib/md5.c
> +index 488d16ef69b4..282e2d22af25 100644
> +--- a/lib/md5.c
> ++++ b/lib/md5.c
> +@@ -21,13 +21,13 @@
> + #if !defined(WORDS_BIGENDIAN)
> + #define byteReverse(buf, len)	/* Nothing */
> + #else
> +-void byteReverse(unsigned char *buf, unsigned longs);
> ++static void byteReverse(unsigned char *buf, unsigned longs);
> +
> + #ifndef ASM_MD5
> + /*
> +  * Note: this code is harmless on little-endian machines.
> +  */
> +-void byteReverse(unsigned char *buf, unsigned longs)
> ++static void byteReverse(unsigned char *buf, unsigned longs)
> + {
> +     uint32_t t;
> +     do {
> +--
> +2.7.4
> +
> --
> 2.7.4

Tested-by: Carlos Santos <casantos@datacom.ind.br>

Rebuilt libpjsip after applying the patch and confirmed it solves the
static linking issue.

-- 
Carlos Santos (Casantos) - DATACOM, P&D
?The greatest triumph that modern PR can offer is the transcendent 
success of having your words and actions judged by your reputation, 
rather than the other way about.? ? Christopher Hitchens